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METHODS AND APPARATUS FOR TESTING ISFET ARRAYS

  • US 20120001646A1
  • Filed: 06/30/2011
  • Published: 01/05/2012
  • Est. Priority Date: 06/30/2010
  • Status: Abandoned Application
First Claim
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1. A method of testing a chemical detecting device comprised of an array of pixel elements, each pixel element including a chemically-sensitive transistor having a source terminal, a drain terminal, and a floating gate terminal, the method comprising:

  • connecting of a group of the chemically-sensitive transistors'"'"' source terminals in common;

    applying first test voltages at the source terminals of the group;

    measuring corresponding first currents at the drain terminals produced by the first test voltages;

    calculating resistance values based on the first test voltages and currents;

    applying second test voltages at the source terminals of the group to operate the group in a different operational mode, wherein the second test voltages are based at least partially on the resistance values;

    measuring a corresponding second set of currents at the drain terminals produced by the second test voltages; and

    based on the second test voltages and currents and operational properties of the chemically-sensitive transistors, calculating a floating gate voltage of each chemically-sensitive transistor in the group.

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